Subcutaneous syringe.



No. 760,248. PATENTD MAY 17, 1904.

' L. REICH.

SUBGU'I'ANEOUS SYRINGE. Y

APPLIoATIoN mmm JAN. 1a. 1904. No MODEL.

111| 111| 1111 1J11 IIIIIIIIIIII Il!! ||1| Illl Ill] lili Illl IIL Illl Illl UNITED STATES Patented May 1'?, 19o/i.

PATENT OEEICE.

u LOUIS REICH, OF REM'DA, GERMANY.

IsueeuTANEous sYmNeE.

SPECIFICATIO forming part of Letters Patent No. 760,248, dated May 17', 1904. Application filed January 13, i904. lSerial No. 188,866. (No model.) l

To all whom 1115 may concern:

Beit known that I, Louis REICH, merchant, a subject of the Grand Duke of Saxe-Weimar, residing at Remda, in the (ji-rand Duchy of SaXe-VVeiinar, German Empire, have invented certain new and useful Improvements in Subeutaneous Syringes, of which the following is a specification.

My invention relates to asubcutaneous syringe which is made entirely'of glass and has an unperforated cylinder, the piston being perforated instead, and is distinguished by the fact that the piston, which is ground at the rear cylindrical end, and cylinder are only made to fit at one part-viz., at the rear endthe cylinder being made funnel-shaped at the front end and adapted to be closed in a tight manner by a thickened portion of the piston and is provided with as large as possible bottom in order that it may stand firmly. Its inside base is arched upward, so that the piston, which is provided with a corresponding concave bottom surface, will completely fill the cylinder at the ground places, whereby any waste of liquid is avoided, formation of air-bubbles precluded, the striking of the cylinder against the piston-handle during testing prevented, convenience of handling secured, and cleansing greatly facilitated.

A subcutaneous or hypodermic syringe according to this inwvention is shown in the accompanying drawings, in Figure l in elevation, in Fig. 2 in longitudinal section, in Fig. 3 in plan, and in Fig. 4.- in horizontal crosssection.

Thc cylinder 1 is provided with a bottom 2, as large as possible and arched upward, and is slightly funnel-shaped for about half of its length-the upper end. The fiat bottom 2 of the cylinder, provided with an outward flange 3, enables the said cylinder to be stood on a table like a measuring vessel and to be filled with the liquid to be injected. The piston 4, which is ground so -as to fit the cylinder only at its lower end and for about half of the length of the cylinder, can while the doctor holds the patient with one hand be introduced with the other hand into the widened top of the cylinder and then used with the latter for the purpose of injection. Owing to the bottom surface or the rear end 6 of the piston t, which has a central longitudinal passage 5, belng concave, the air 1n the cylmder l is retained when the piston is introduced and when the latter is lowered is expelled through the central passage 5 to the last particle. On further descent of the piston the liquid is completely driven out, since the concave bottom surface 6 of the piston et fits the convex bottom of the cylinder-bottom 2 closely. In this way the syringe is completely emptied, and in this way the amount of liquid injected may be accurately determined.

In order to render the piston 4f more convenient to seize, it is provided at its top end Witha partially annular projection 7, flattened at the sides. Since in glass syringes of the well-known type in which the piston fits the cylinder throughout the whole of its length the so-called seizing cannot be avoided and the piston frequently becomes jammed, the piston according to this invention for the purpose of avoiding the above drawback is provided with a reduced portion in the center, and, therefore, although it does not entirely fit the cylinder, yet efficiency of thel instrument is not affected thereby. The piston is also provided below the projection 7 with a conical thickened part fr, which closes the funnel-shaped portion of the cylinder. In this way the injurious and annoying seizing is avoided and at the same time an air-brake obtained which prevents the edge of the cylinder from striking the projection 7 during the testing of the syringe. A further great advantage of the enlargement of the cylinder 8 is the fact that the space y, formed through the reduced part of the piston 4 and the cylinder-wall, can be filled in with any aseptic Huid during the non-use of syringe and hermetically closed through the thicker part The aseptie fiuid may then gradually suck through to the bottom of the cylinder and prevent the cultivation of microbes and the sticking' fast of the piston in the cylinder.

The cylinder 1 may be provided with divisions in the well-known manner, and its ground inner surface gradually merges at the top into a funnel-shaped extension 8. The ground portion does not, therefore, end in a distinct IOO and sharp manner, but widens gradually from top to bottom or from rear to front, so that about half the length of the cylinder is iilled up by the piston without any clearance, While the upper or front half of the cylinder surrounds the piston loosely, whereby the abovementioned ease of introducing the piston and a perfect aseptic keeping of the syringe is insured.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is- A subcutaneous syringe made entirely of glass with an unperforated cylinder and aperforated piston, characterized by the piston and the cylinderl being only ground to partially fit over each other-viz: at the rear or lower end, the cylinder being widened in the shape of a funnel at the front or upper end and 4ing testing precluded, ease of handling the syringe and cleansing as well as by filling with aseptic uid aseptic cleanliness insured.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

Y LOUIS REICH.

I/Vitnesses: Y

E. BREUSING,

O. HINZE. 

